Ysolda

Ysolda is a female Nord found in Whiterun. When you first speak to her she'll tell you that she wishes to become the best tradesperson in Skyrim, inspired by the Khajiit caravan parties that wander all over Skyrim. She’ll further explain that she has asked the help and aid of the Khajiit to start her own Merchant/caravan business of her own. However for them to help her she requires to present them with a mammoth’s tusk.

If you volunteer to help her out she’ll train you in speech. It’s a simple quest. Just west of Whiterun is a Giant Camp with 3 or 4 mammoths. Take one of them down. (Best way to do this is a distance attack one mammoth, it'll charge you singling it out from amongst the others. Just be aware it maybe followed by one of the giant's). If you are not high enough level (20 or lower) then it will be very hard to kill a mamoth and/or Giant. There is the Halted Steam Camp, Northwest of Whiterun with a mine, go inside of the mine and there is a wheelbarrow with 3 or more mammoth tusks sitting on it. doing this will save you time and money. You can also buy one for 400-500 gold from the Khajiht Camp outside of Whiterun. The eaisest way is going to into Jorrvaskar (The big Viking Ship) in Whiterun. Once inside walk to the left till you see a room, once in the room close the doors and steal the mammoth tusk.

Search it for it’s tusk and bring it back to her.

After you have completed this, she’ll be available to you for Marriage.